Michael Kok, author of the blog The Jesus Memoirs, has begun blogging about Hebrews. His first post deals briefly with introductory issues, theology of Hebrews, and supercessionism in the Patristic period. In his second post he plugs my own blog (thanks for the endorsement!).
A word of clarification: the "bibliography" I provide on the blog are links to books, articles, etc. that are available online and, for the most part, not hidden behind paywalls (This changed somewhat when RBL decided to put its book reviews behind a paywall, but I have not removed the links).